engleski

NON-STATIONARY PARAMETER SENSITIVITY ANALYSIS OF A MODIFIED ACTIVATED SLUDGE MODEL No. 3

The aim of this study was to perform global parametric sensitivity analysis of the modified Activated Sludge Model No. 3 (mASM3) using Fourier Amplitude Sensitivity Test (FAST). The analysed ASM3 model (Iacopozzi et al., 2007) is a modification of the existing Activated Sludge Model No. 3. Enhancement of the basic ASM3 model involves splitting the nitrification and denitrification process in a two- step process and describing denitrification of both, nitrate and nitrite. In the nitrification process, ammonium and dissolved oxygen act as limiting factors. This model includes 14 mass balances, 16 reaction rates and 40 stoichiometric and kinetic parameters. The FAST method ensures sensitivity to a large and simultaneous change of the complete set of the model parameters. The principle of this method includes transformation of multidimensional space of model parameters to one-dimension space of a single parameter. Since reduction of nitrate and nitrite to dinitrogen involves complex enzymatic transformations, the application of FAST will ensure non-stationary parametric sensitivities of the most important model variables ; nitrite (SNO2) and nitrate (SNO3). Results of the FAST analysis have application in identification and optimization of key parameters in enzymatic regulation to improve the model.

wastewater treatment ; Fourier Amplitude Sensitivity Test (FAST) ; activated sludge model (ASM3)

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